res_pjsip: Add contact_user to endpoint

contact_user, when specified on an endpoint, will override the user
portion of the Contact header on outgoing requests.

Change-Id: Icd4ebfda2f2e44d3ac749d0b4066630e988407d4

2 files changed, 53 insertions, 0 deletions

diff --git a/res/res_pjsip.c b/res/res_pjsip.c
index 8a9a19db8..34edc8ca5 100644
--- a/res/res_pjsip.c
+++ b/res/res_pjsip.c
@@ -916,6 +916,12 @@
 						then the <replaceable>context</replaceable> setting is used.
 					</para></description>
 				</configOption>
+				<configOption name="contact_user" default="">
+					<synopsis>Force the user on the outgoing Contact header to this value.</synopsis>
+					<description><para>
+						On outbound requests, force the user portion of the Contact header to this value.
+					</para></description>
+				</configOption>
 			</configObject>
 			<configObject name="auth">
 				<synopsis>Authentication type</synopsis>
@@ -2865,8 +2871,16 @@ pjsip_dialog *ast_sip_create_dialog_uac(const struct ast_sip_endpoint *endpoint,
 	/* Update the dialog with the new local URI, we do it afterwards so we can use the dialog pool for construction */
 	pj_strdup_with_null(dlg->pool, &dlg->local.info_str, &local_uri);
 	dlg->local.info->uri = pjsip_parse_uri(dlg->pool, dlg->local.info_str.ptr, dlg->local.info_str.slen, 0);
+
 	dlg->local.contact = pjsip_parse_hdr(dlg->pool, &HCONTACT, local_uri.ptr, local_uri.slen, NULL);
 
+	if (!ast_strlen_zero(endpoint->contact_user)) {
+		pjsip_sip_uri *sip_uri;
+
+		sip_uri = pjsip_uri_get_uri(dlg->local.contact->uri);
+		pj_strdup2(dlg->pool, &sip_uri->user, endpoint->contact_user);
+	}
+
 	/* If a request user has been specified and we are permitted to change it, do so */
 	if (!ast_strlen_zero(request_user)) {
 		pjsip_sip_uri *sip_uri;
@@ -3168,6 +3182,18 @@ static int create_out_of_dialog_request(const pjsip_method *method, struct ast_s
 		return -1;
 	}
 
+	if (endpoint && !ast_strlen_zero(endpoint->contact_user)){
+		pjsip_contact_hdr *contact_hdr;
+		pjsip_sip_uri *contact_uri;
+		static const pj_str_t HCONTACT = { "Contact", 7 };
+
+		contact_hdr = pjsip_msg_find_hdr_by_name((*tdata)->msg, &HCONTACT, NULL);
+		if (contact_hdr) {
+			contact_uri = pjsip_uri_get_uri(contact_hdr->uri);
+			pj_strdup2(pool, &contact_uri->user, endpoint->contact_user);
+		}
+	}
+
 	/* Add the user=phone parameter if applicable */
 	ast_sip_add_usereqphone(endpoint, (*tdata)->pool, (*tdata)->msg->line.req.uri);
 
diff --git a/res/res_pjsip/pjsip_configuration.c b/res/res_pjsip/pjsip_configuration.c
index 9871b4186..3bced1180 100644
--- a/res/res_pjsip/pjsip_configuration.c
+++ b/res/res_pjsip/pjsip_configuration.c
@@ -1208,6 +1208,31 @@ static int voicemail_extension_to_str(const void *obj, const intptr_t *args, cha
 	return 0;
 }
 
+static int contact_user_handler(const struct aco_option *opt,
+	struct ast_variable *var, void *obj)
+{
+	struct ast_sip_endpoint *endpoint = obj;
+
+	endpoint->contact_user = ast_strdup(var->value);
+	if (!endpoint->contact_user) {
+		return -1;
+	}
+
+	return 0;
+}
+
+static int contact_user_to_str(const void *obj, const intptr_t *args, char **buf)
+{
+	const struct ast_sip_endpoint *endpoint = obj;
+
+	*buf = ast_strdup(endpoint->contact_user);
+	if (!(*buf)) {
+		return -1;
+	}
+
+	return 0;
+}
+
 static void *sip_nat_hook_alloc(const char *name)
 {
 	return ast_sorcery_generic_alloc(sizeof(struct ast_sip_nat_hook), NULL);
@@ -1905,6 +1930,7 @@ int ast_res_pjsip_initialize_configuration(void)
 	ast_sorcery_object_field_register_custom(sip_sorcery, "endpoint", "contact_permit", "", endpoint_acl_handler, NULL, NULL, 0, 0);
 	ast_sorcery_object_field_register_custom(sip_sorcery, "endpoint", "contact_acl", "", endpoint_acl_handler, contact_acl_to_str, NULL, 0, 0);
 	ast_sorcery_object_field_register(sip_sorcery, "endpoint", "subscribe_context", "", OPT_CHAR_ARRAY_T, 0, CHARFLDSET(struct ast_sip_endpoint, subscription.context));
+	ast_sorcery_object_field_register_custom(sip_sorcery, "endpoint", "contact_user", "", contact_user_handler, contact_user_to_str, NULL, 0, 0);
 
 	if (ast_sip_initialize_sorcery_transport()) {
 		ast_log(LOG_ERROR, "Failed to register SIP transport support with sorcery\n");
@@ -2036,6 +2062,7 @@ static void endpoint_destructor(void* obj)
 	ao2_cleanup(endpoint->persistent);
 	ast_variables_destroy(endpoint->channel_vars);
 	AST_VECTOR_FREE(&endpoint->ident_method_order);
+	ast_free(endpoint->contact_user);
 }
 
 static int init_subscription_configuration(struct ast_sip_endpoint_subscription_configuration *subscription)